P05-07 The association between 24-hour activity composition and back pain in Slovenian university students

Abstract Background Back pain is the most common musculoskeletal symptom. Several risk/protective factors, including sedentary behaviour, physical activity and sleep, have been proposed. Research has typically examined these time-use behaviours in isolation, ignoring the compositional nature of time-use data. The aim of this study was to determine the relationship between a 24-hour activity composition and back pain in university students using compositional isotemporal substitution modelling. Methods A cross-sectional study of 135 Slovenian university students (20 ± 2 years, 70% male) assessed 24-hour time use and back pain. Volunteers completed the SIMPAQ questionnaire (asking about the activity time divided into three categories: sedentary, in bed, and physical activity) and the BackPEI questionnaire (asking about back pain in the past 3 months). The compositional isotemporal substitution analysis based on a logistic regression model was used to examine the association between the activity composition and the occurrence of back pain. The compositional isotemporal substitution analysis based on a linear regression model was used to examine the association between the activity composition and back pain intensity, for those that experienced it. Both models were adjusted for age, sex and BMI. Results The prevalence of back pain in the past 3 months was 62%. The 24-hour activity composition was associated with back pain intensity in the symptomatic subgroup, while no associations with the occurrence of back pain was found. Reallocation of 30 minutes from sedentary behaviour to physical activity was associated with a mean reduction of back pain intensity by 0.1 (95% CI: 0.01 to 0.201) on a continuous 10-point Visual Analog Scale. Likewise, the opposite reallocation was associated with an increase of back pain intensity by 0.1 (95% CI: 0.003 to 0.21). No significant associations with the intensity of back pain were found for reallocations of 30 minutes to and from bed time. Conclusion Study findings indicate that reallocating time from sedentary behaviour to physical activity has a favourable association with back pain intensity. However, the effect size was relatively small and findings need to be interpreted with caution. Further studies including more precise measures of exposure and with larger sample sizes are warranted


Background
Back pain is the most common musculoskeletal symptom. Several risk/protective factors, including sedentary behaviour, physical activity and sleep, have been proposed. Research has typically examined these time-use behaviours in isolation, ignoring the compositional nature of time-use data. The aim of this study was to determine the relationship between a 24hour activity composition and back pain in university students using compositional isotemporal substitution modelling. Methods A cross-sectional study of 135 Slovenian university students (20 AE 2 years, 70% male) assessed 24-hour time use and back pain. Volunteers completed the SIMPAQ questionnaire (asking about the activity time divided into three categories: sedentary, in bed, and physical activity) and the BackPEI questionnaire (asking about back pain in the past 3 months). The compositional isotemporal substitution analysis based on a logistic regression model was used to examine the association between the activity composition and the occurrence of back pain. The compositional isotemporal substitution analysis based on a linear regression model was used to examine the association between the activity composition and back pain intensity, for those that experienced it. Both models were adjusted for age, sex and BMI.

Results
The prevalence of back pain in the past 3 months was 62%. The 24-hour activity composition was associated with back pain intensity in the symptomatic subgroup, while no associations with the occurrence of back pain was found. Reallocation of 30 minutes from sedentary behaviour to physical activity was associated with a mean reduction of back pain intensity by 0.1 (95% CI: 0.01 to 0.201) on a continuous 10-point Visual Analog Scale. Likewise, the opposite reallocation was associated with an increase of back pain intensity by 0.1 (95% CI: 0.003 to 0.21). No significant associations with the intensity of back pain were found for reallocations of 30 minutes to and from bed time.

Conclusion
Study findings indicate that reallocating time from sedentary behaviour to physical activity has a favourable association with back pain intensity. However, the effect size was relatively small and findings need to be interpreted with caution. Further studies including more precise measures of exposure and with larger sample sizes are warranted Keywords: compositional data analysis, time use, spinal health, risk factor, epidemiology Abstract citation ID: ckac095.075 P05-08 Correlation between physical activity, Sleep componants and quality: In the context of type and intensity: A cross-sectional study among sudanese medical students Ahmed Abdelghyoum mahgoub 1 , Shahenaz Satti Mustafa 1 1 Faculty of Medicine, Al-Neelain University, Khartoum, Sudan Corresponding author: Aabdelghayoum@gmail.com

Background
Physical activity during the day is composed of different domains, specifically work related, transportation, and recreation, physical activity. We aimed at studying the correlation between energy expenditure and the corresponding metabolic equivalent of task and sleep in the context of type of physical activity, general level of activity as to be low, moderate and vigorous and the intensity of activity either moderate or vigorous physical activity.

Methodology
A cross-sectional study, participants were n = 273 enrolled from al-Neelain university faculty of medicine between January and April 2021 we used the global physical activity questionnaire to measure standard metabolic equivalent of task (MET) for participants for vigorous and moderate work MET, Transportation MET, Vigorous and moderate lesiure MET, and sedentary time. we used Pittsburgh sleep quality index to assess different components of sleep (subjective sleep quality, sleep latency, habitual sleep efficiency, sleep duration, sleep disturbances, use of medications, daytime dysfunction) and sleep quality.

Conclusion
Our results show that poor sleep quality is primarily influenced by the type and intensity of physical activity. Eliciting a doseresponse effect of different domains, being deleterious for work related physical activity as work MET is of too low intensity or too long duration for maintaining or improving cardiorespiratory fitness and cardiovascular health subsequently Abstract citation ID: ckac095.076 P05-09 Associations of the physical activity-related injuries with selected variables in adolescents -results of the pilot study

Background
Physical activity (PA) as health promotion tool is not one without adverse effects and adolescents with nonfatal physical activity-related injuries (PARI) may experience serious health consequences for the rest of their lives. Methods As a part of the pilot study of the Health Behaviour in Schoolaged Children Study conducted in October and November 2021 in Slovakia, we surveyed 119 adolescents (53 girls; average age 12,6AE2,0) for moderate-to-vigorous physical activity (MVPA), medically attended injuries (MAI), physical activity-related injuries in sports clubs (PARISC), physical activity-related injuries in leisure-time (PARILT) and physical activity-related injuries in schools (PARIS) and we measured their cardiorespiratory fitness (using 20-metre shuttle run) and their body composition (using InBody 230).

Results
Out of 119 adolescents, 50 (42%) were attending sports clubs of which 27 (54%) had one or more PARI in sports clubs'